updated concurrency examples

decorators/generic.py

@@ -24,6 +24,8 @@ htmlize(): generic function example
 # BEGIN HTMLIZE
 
 from functools import singledispatch
+from collections import abc
+import numbers
 import html
 
 @singledispatch  # <1>
@@ -36,13 +38,14 @@ def _(text):            # <3>
     content = html.escape(text).replace('\n', '<br>\n')
     return '<p>{0}</p>'.format(content)
 
-@htmlize.register(int)  # <4>
+@htmlize.register(numbers.Integral)  # <4>
 def _(n):
     return '<pre>{0} (0x{0:x})</pre>'.format(n)
 
-@htmlize.register(list)
-def _(a_list):
-    inner = '</li>\n<li>'.join(htmlize(item) for item in a_list)
+@htmlize.register(tuple)  # <5>
+@htmlize.register(abc.MutableSequence)
+def _(seq):
+    inner = '</li>\n<li>'.join(htmlize(item) for item in seq)
     return '<ul>\n<li>' + inner + '</li>\n</ul>'
 
 # END HTMLIZE